24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 Tamper-Proof Security – Features a

Tamper-Proof Security – Features a robust design to prevent unauthorized access and protect your thermostat settings

Lock and Key included

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Commercial Grade Aluminum - Will Never Rust - Designed for Warehouses

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 Tamper-Proof Security – Features a+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 35. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum